What does the word overlay mean?

Usage examples for overlay

  1. Or to use a better measure, she exceeds in population one of the states that would overlay all New England. – Revisiting the Earth by James Langdon Hill
  2. According to Madame de Bourboulon, Siberia is more civilized than old Russia; so true is it that it is easier to overlay a new country with civilization than to rejuvenate an old one. – Celebrated Women Travellers of the Nineteenth Century by W. H. Davenport Adams